Gavin Newsom, said SAG-AFTRA President Fran Drescher.
That has drawn opposition from major companies like OpenAI, as well as from former House Speaker Nancy Pelosi.
Hollywood figures such as Sean Astin and Mark Ruffalo have encouraged Newsom to sign the bill.
Gavin NewsomGetty Images
Later today, Newsom also signed a trio of bills to limit the use of deepfakes in election campaigns.
Campaign ads will have to disclose when they use AI-generated content.